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Old 03-03-2003, 07:45 PM
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Post 350 build parts combination conflict?

I am building a 1975 350 and so far im planning to bore it .030 and go with 9.7:1 comp (comp. checked w/ 64 cc chambers). I havent decided on forged or hypereutectic yet I need to see what the budget allows for. I would like to run a comp cams magnum cam 270 ad. 224 at .50. hydraulic lifters, I plan on replacing the main bolts and rod bolts. I am going with a new cast crank and using stock rods. I am going to get the rotating assembly balanced. I may go with new valve springs if mine dont check out or the cam is too much for them. I am going with 58cc 305 heads 1.84 1.5 valves or from what i hear bad casting # 350 heads with 76 cc chambers 1.94 1.5 valves. The engine is going in a 1979 camaro with a TH 350 for starters and then later a TH 700 R4 for the lower first 2 gears and overdrive. My rearend ratio is 2.41:1 and the car weighs around 3400 I believe. Will this engine combo work or will I need a different cam or heads etc. Please share your advice with me or i might end up with a very heavy paper weight. I would like a fairly strong engine at low rpm and yet I would like it to rev out decently. thanks for your time.

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Old 03-03-2003, 10:49 PM
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I don`t see much wrong with your combo, but I wouldn`t run the 305 heads, with a flat top piston, compression would be over 10:1 and it would detonate like crazy. you would need a dished piston with 305 heads due to there 58 cc chambers. replaceing the main and rod bolts aren`t needed if all you want is a street engine, so take that cash and put it elsewhere. just have the rods checked and see if any need resized. the cam is a little big also, if your after low end torque, then I`d run the comp magnum 268, 218/218 duration and 454 lift or something similiar. you`ll need the extra low end until you get the other tranny. run a dual plane intake and a 600 to 625 cfm carb, a set of spiral core plug wires and new high po module and coil, and you`ll have a very driveable package that still gets decent milage, trust me, you`ll be a lot happier with it. the comp cam with 224 duration would likely have a cruise rpm of 2600 -2800, and when you get your 700R4 with 2.41 gears in the rear it`ll cruise at 1500 RPM`s likely or lower at 60 MPH and will have no power and will drink gas. your car and your call. Good Luck.
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Old 03-05-2003, 08:48 PM
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I went to my local machine shop and found a set of dart heads for 300.00. They are 1.94 intake and 1.5 exhaust. I am putting new springs on them that will best suit my cam. I think I will go with the 268 cam, I was looking at one similer to it. I think the heads are 68cc or 72cc. I am running a rochester qjet and am going to modify one of the many I have around this summer for it. I plan on using a weiand 8004 dual plane manifold.I think with this head piston combination I should be able to run poor pump gas if I need to while in smaller towns. Any thaughts or suggestions on this?
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